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Solve the equation.7x-9=16

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The linear equation 7x+9y=8 has a unique solutions

Solve the equation.(9x)/(7-6x)=15

Some equations have been solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis. If 9* 7 = 32, 13 * 7 = 120, 17 *9 = 208, then 19 * 11 = ?

Number of roots of the equation 3^2.x^2-7x+7= 9 is